Expecting payment for 2 months of which we had no benefit of FIBRE

We have been struggling with Webafrica for 2months, first we received a faulty router and upon replacement we struggled for weeks to have it configured to work. We received an invoice for 2 months without benefiting from the FIBRE. We constantly tried to phone, constantly sending emails and for the first time it properly worked was on the 24th July 2020. Webafrica are expecting us to pay for 2 months of which we received no service, the sales consultant whom we dealt with said we will only be invoiced once the connection are working and we are happy that we have Internet connection, now it is a whole different story